Lighting Device Phosphor Surface Scanning Deflection Mirror
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Solution Overview
Problem
Existing lighting technologies face challenges in generating temporally varying light distributions with high brightness without excessive peak power density on conversion colorants, especially in high-resolution applications like vehicle headlights, where momentary peak power densities become too high to be realized effectively.
Innovation Solution
A lighting device with a light generating unit producing at least two spaced-apart light beams that impinge on a phosphor surface using a movable deflection mirror, allowing regions of the phosphor surface to be illuminated successively by multiple beams, reducing peak power density and achieving high brightness through a remote phosphor arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high power density is used to achieve high brightness and intense illumination, then illumination intensity is improved, but peak power density on the conversion colorant becomes excessively high and may become unrealizable
Solution Approach 1:
The patent divides the illumination task into multiple light beams that are spatially separated and sequentially directed to different regions of the phosphor surface. This segmentation allows the total luminous flux to be distributed across multiple beams, reducing the peak power density on any single beam while maintaining high illumination intensity through temporal multiplexing
Solution Approach 2:
The patent employs periodic scanning of multiple light beams across the phosphor surface in a time-multiplexed manner. The movable deflection mirror sequentially directs different light beams to different phosphor regions at different times, creating a periodic illumination pattern that reduces instantaneous peak power density while maintaining high average brightness
2Manufacturing precision
If high resolution (small spatial pixels) is implemented, then manufacturing precision is improved, but momentary peak power density on the conversion colorant becomes very great
Solution Approach 1:
The patent segments the high-resolution phosphor surface into multiple small spatial pixels that are illuminated by different light beams at different times. The movable deflection mirror scans multiple beams across the surface, assigning each beam to illuminate specific high-resolution pixels sequentially, thereby achieving high spatial resolution without concentrating excessive power density on any single pixel
Solution Approach 2:
The patent uses a dynamically scanning movable deflection mirror to redirect multiple light beams across the phosphor surface. This dynamic scanning allows the system to address each high-resolution pixel with appropriate power levels by sequentially directing different beams to different pixels, maintaining high resolution while managing peak power density through temporal distribution
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces peak power density and achieves high brightness by distributing the luminous flux over time, enabling efficient generation of temporally varying light distributions suitable for high-resolution applications like vehicle headlights.
Implementation Method 1
a phosphor surface which is illuminatable by the light beams
Implementation Method 2
at least one movable deflection mirror for the scanning deflection of the light beams onto the phosphor surface
Data Source
AI summary
A lighting device may include a light generating unit configured to generate at least two light beams; at least one phosphor surface which is illuminatable by the light beams; and at least one movable deflection mirror for the scanning deflection of the light beams onto the phosphor surface, such that the light beams impinge on the at least one phosphor surface in a spaced-apart fashion, and such that at least one region of the phosphor surface is illuminatable by at least two light beams in a manner spaced apart temporally.